分解因式1.-a^6+28a^3-272.4a^4+3a^2-27现在就要答案,明天就交,

Question

分解因式 1.-a^6+28a^3-27 2.4a^4+3a^2-27现在就要答案,明天就交,

Answer 1

1.-a^6+28a^3-27
=-(a^6-28a³+27)
=-(a³-1)(a³-27)
=-(a-1)(a²+a+1)(a-3)(a²+3a+9)
2.4a^4+3a^2-27
=(4a²-9)(a²+3)
=(2a+3)(2a-3)(a²+3)